Which of the following is not classified as a disorder of the oil glands?

Psoriasis is primarily classified as a chronic inflammatory skin disorder that impacts the life cycle of skin cells, leading to the rapid accumulation of cells on the skin’s surface. This results in scaling and red patches that can be itchy and sometimes painful. Unlike acne, seborrhea, and chloasma, which are related to the function or dysfunction of the oil glands (sebaceous glands), psoriasis does not directly involve oil production or hormonal changes associated with these glands.

While acne is characterized by the blockage and inflammation of hair follicles and sebaceous glands, and seborrhea involves an overproduction of oil leading to scaling and redness, chloasma—though primarily a pigmentation disorder—often relates indirectly to oil gland activity due to hormonal influences. In contrast, psoriasis originates from an immune-related condition rather than a problem with the oil glands, distinguishing it from the other options.